Light-seal for photographic-plate holders.



No. 787,424. PATENTED APR. 18, 1905. J. S. WRIGHT. LIGHT SEAL FORPHOTUGRAPHIC PLATE HOLDERS.

APPLICATION FILED JUNE 11,1904.

2 SHEETS-SHEET 1.

No. 787,424. Y PATENTED APR. 18, 1905.

J. S. WRIGHT. LIGHT SEAL FOR PHOTOGRAPHIG PLATE HOLDERS.

ABPLIOATION FILED .TUNE 11,1904.

2 SHEETS-SHEET 2.

f @L/@Lge Jiu/entom- -of Fig. 1.

holder of said camera, taken on line 8 8 of JOHN S. WVRIGHT, OF DUXBURY,

Patented April 18, 1905.

PATENT OEEICE.

MASSACHUSETTS.

LIGHT-SEAL FOR PHOTOGRAPHlC-PLATE HOLDERS.

SPECIFICATION forming part of Letters Patent No. 787,424, dated April18, 1905.

Application filed lune 11,1904. Serial No. 212,060.

To (1J/Z whom, it weary concern: j Beit known that I, J oi-IN S. VRIGHT,a citil zen of the United States, lresiding at Duxbury, in the county ofPlymouth and State of Massachusetts, have invented new and usefulImprovements in Light-Seals for Photographic-Plate Holders, of which thefollowing is a specification.

This invention relates to an improvement in cameras and plate-holderstherefor which has for its object to quickly land perfectly close theslot through which the light-shield slide of the camera or of theplate-holder is introduced, and thus avoid any possibility of injury tothe photographic plates or films by reason of light entering said cameraor plateholder through said slot.

The invention consists in certain details of construction andcombination of parts, as set forth in the following specification andparticularlypointed out in the claims thereof.

Referring to the drawings, Figures 1 to 5, inclusive, illustrate myimproved light-guard as applied to a plate-holder adapted to contain twophotographic plates. Figs. 6 to 9, inclusive, illustrate my improvedlight-guard applied to a camera-casing.

Fig. 1` is afront elevation of aphotographicplate holder constructed inaccordance with my invention, the same being partly broken away to savespace in the drawings. Fig. 2 is a section taken on line 2 2 of Fig. 1.F ig. 3 is a section, partly in elevation, taken on line 3 3 Fig. 4 is asection, partly in elevation, taken on line 44 of Fig. 1. Fig. 5 isasection similar to Fig. 3 with one of the light-shield slides removed.Figs. 3, 4, and 5 are each broken away to save space in the drawings.Fig. 6 is a side elevation of a folding pocketcamera with my improvedlight-guard attached thereto adapted to contain a roll-ilm. Fig. 7 is atransverse section of the Vlilm- Fig. 6. Fig. 8 is a detail sectionthrough a portion of one side wall of the film-roll holder, taken online 9 9 of Fig. 6. Fig. 9 is a detail section through one of the sidewalls of the film-holder, taken on line 9 9 and similar to Fig. 7 withthe light-shield slide withdrawn.

. tion being common in this art.

consisting of a hollow rectangular frame or casing 16, having four sides17, 1S, 19, and 20. Two light-shield slides 21 and 22 are provided insaid holder. The side 17 is provided with slots 23 and 24, through whichthe slides 21 and 22, respectively, project. The sides 18, 19, and 2Uare also provided with grooves for the reception of the sides,respectively, of the slides 21 and 22, such construc- To prevent thelight from entering the plate-holder when the slides are withdrawn, twolight-guards 25 and 26 are provided, adapted to slide in ways 27 in theside 17 and between the slides 21 and 22. Said guards are forced apartand against the slides 21 and 22 by a flat spring 28, located betweensaid guards and formed of two leaves 29 and 30, oined together' by arivet 31. Recesses 32 and 38 are provided in the side 17 adjacent to andextending transversely of the slots 23 and 24, respectively, and uponthe opposite sides, respectively, of the slides 21 and 22 from that uponwhich the light-guards 25 and 26 are located.

Each of the light-guards 25 and 26 has a beveled or chamfered outer edge34 and 35, respectively. Said light-guards 25 and 26 are each providedwith guide-plates 36 and 37, respectively, fast thereto and extendingtherefrom toward the outer edge of the side 19 at an acute angle to theslots 23 and 24, respectively.

The operation of the slide and light-guard in my improvedphotographic-plate holder is as follows: Assuming the slide 22 to havebeen already inserted in the plate-holder and the slide 21 removedtherefrom, as illustrated in Fig. 5, it will be seen that the lightguard25 is forced by the spring 2S across the slot 23 and into the recess 32,while the lightguard 26 is forced by the spring 2S against the slide 22,holding the same firmly in position against the side 17 of theplate-holder.

To insert the slide 21 in the plate-holder, said slide is pushed.downwardly into the slot 23, with its edge parallel to the outer edge ofthe side 17, until the edge of said slide strikes the inclinedguide-plates 36 36, fast to the light-guard 25, and forces said plates,together with the light-guard 25, toward the left from the positionshown in Fig. 5 to that shown in Figs. 3 and 4 Upon the withdrawal ofeither of the slides from the plateholder its respective light-guardwill be forced across the slot 23 or 24 and into the recess 32 or 33, asthe case may be, completely preventing any light from entering theplate-holder through the slot in the side 17 for the reception of thelight-shield slide.

In the insertion of the slide hereinbefore described the edge of theslide first contacts with the angular guide-plates 36, and subsequentlyas the slide is forced back the edge of the slide contacts not only withsaid guide-plates, .but also with the chamfered edge 34, said chamferededge thus assisting in the withdrawal of the light-guard from the recess32.

ln Figs. 6 to 9, inclusive, I have illustrated a form of my inventionvin which the lightguard is applied directly to the casing of a camera,which may be of any desirable form. ln the present instance said camerais known as a folding pocket-camera and is made in two parts 39 and 40.rlhe part 39 contains a focal-plane shutter mechanism, and the part 40is a roll-film holder, said parts being joined together by aspring-catch 41. The film 42 is shown in dotted lines and is wound uponrolls 43 and 44. rl`he light-shield slide 21 is inserted through a slot22 in the side 17 of the film-holder casing 40. The lightguard 25 isadapted to slide in ways 27, provided in the side 17 and is forcedtoward the right, Fig. 7, and against the light-shield slide 21 byspiral springs 28', inserted in the side 17, and when said slide 21 isremoved, as illustrated in Fig. 9, said springs force the light-guard 25across the slot 22 and into a recess 32, formed in the side 17 adjacentto the slot 22 and extending transversely thereof, thus cutting off alllight which might otherwise pass through the slot 23 and into theinterior of the camera-casing. The light-guard 25 is provided withguide-plates 36 and with a beveled or chamfered edge 34', as in the formof my invention illustrated in Figs. 1 to 5, inclusive.

The operation of inserting the slide and withdrawing the same and theoperation of the light-guard in being forced across the slot 23 and intothe recess 32 is substantially the same as in the other' form of myinvention hereinbefore described. In both of the forms of my inventionit will be noted that in order to introduce the slide into the casingand through the slot in the side of said casing it is necessary that theslide should be placed with the entire edge thereof parallel to the sideof the casing in order that the light-guard may be forced back, so thatone corner of said slide cannot be inserted, thus partly opening thelight-guard and allowing the light to pass through before the slideenters and passes through the entire slot formed in the side of thecasing therefor.

The advantages derived from my improved light-guard reside in the factthat said light-guard is of a very substantial construction and is heldnot only across the slot, but into a recess upon the opposite side ofsaid slot from that in which the light-guard itself is located, thusmaking a complete cut-off of the light. Again, it is necessary that theslide should be inserted with its entire edge parallel to thelight-guard and to the side of the camera through which said entire edgeis passed.

Having thus described my invention, what l claim, and desire by LettersPatent to secure, is-

1. A photographic-plate holder comprising in its construction a casingprovided with a slot extending through one wall thereof and adapted toreceive a light-shield slide, a light-guard having a flat top with abeveled edge constructed to slide transversely of said slot in waysprovided in said casing, said casing provided with a recess adjacent toand extending transversely of said slot, into which recess said bevelededge is adapted to project, with said flat top extending across saidslot, a guide-plate fast to said top adj acent to said beveled edge andextending upwardly therefrom at an acute angle to said slot, and aspring acting to normally held said light-guard across said slot.

2. A photographic-plate holder comprising in its construction a casingprovided with a slot extending through one wall thereof and adapted toreceive a light-shield slide, a light-guard having a flat topconstructed to slide transversely of said slot in ways provided in saidcasing, said casing provided with a recess adjacent to and extendingtransversely of said slot, said flat top extending entirely across saidslot, a guide-plate fast to said top, extending upwardly therefrom at anacute angle to said slot and extending a portion of the length of saidlight-guard, and a spring acting to normally hold said lightguard acrosssaid slot.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

JOHN S. VRIGUT.

Witnesses:

CHARLES S. GooDrNG, SYDNEY E. TAFT.

IOC

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